tree: https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next head: 871997bc9e423f05c7da7c9178e62dde5df2a7f8 commit: 3194a1746e8aabe86075fd3c5e7cf1f4632d7f16 [7/9] xen-netback: don't "handle" error by BUG() config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git/commit/?id=31... git remote add xen-tip https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git git fetch --no-tags xen-tip linux-next git checkout 3194a1746e8aabe86075fd3c5e7cf1f4632d7f16 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/net/xen-netback/netback.c: In function 'xenvif_tx_action': 1334 | int work_done, ret; | ^~~ vim +/ret +1334 drivers/net/xen-netback/netback.c 3e2234b3149f66 Zoltan Kiss 2014-03-06 1328 f53c3fe8dad725 Zoltan Kiss 2014-03-06 1329 f942dc2552b8bf Ian Campbell 2011-03-15 1330 /* Called after netfront has transmitted */ e9ce7cb6b10740 Wei Liu 2014-06-04 1331 int xenvif_tx_action(struct xenvif_queue *queue, int budget) f942dc2552b8bf Ian Campbell 2011-03-15 1332 { bdab82759b8e36 Zoltan Kiss 2014-04-02 1333 unsigned nr_mops, nr_cops = 0; f53c3fe8dad725 Zoltan Kiss 2014-03-06 @1334 int work_done, ret; b3f980bd827e6e Wei Liu 2013-08-26 1335 e9ce7cb6b10740 Wei Liu 2014-06-04 1336 if (unlikely(!tx_work_todo(queue))) b3f980bd827e6e Wei Liu 2013-08-26 1337 return 0; f942dc2552b8bf Ian Campbell 2011-03-15 1338 e9ce7cb6b10740 Wei Liu 2014-06-04 1339 xenvif_tx_build_gops(queue, budget, &nr_cops, &nr_mops); f942dc2552b8bf Ian Campbell 2011-03-15 1340 bdab82759b8e36 Zoltan Kiss 2014-04-02 1341 if (nr_cops == 0) b3f980bd827e6e Wei Liu 2013-08-26 1342 return 0; f942dc2552b8bf Ian Campbell 2011-03-15 1343 e9ce7cb6b10740 Wei Liu 2014-06-04 1344 gnttab_batch_copy(queue->tx_copy_ops, nr_cops); 3194a1746e8aab Jan Beulich 2021-02-15 1345 if (nr_mops != 0) e9ce7cb6b10740 Wei Liu 2014-06-04 1346 ret = gnttab_map_refs(queue->tx_map_ops, f53c3fe8dad725 Zoltan Kiss 2014-03-06 1347 NULL, e9ce7cb6b10740 Wei Liu 2014-06-04 1348 queue->pages_to_map, 9074ce24932186 Zoltan Kiss 2014-04-02 1349 nr_mops); f942dc2552b8bf Ian Campbell 2011-03-15 1350 e9ce7cb6b10740 Wei Liu 2014-06-04 1351 work_done = xenvif_tx_submit(queue); b3f980bd827e6e Wei Liu 2013-08-26 1352 b3f980bd827e6e Wei Liu 2013-08-26 1353 return work_done; f942dc2552b8bf Ian Campbell 2011-03-15 1354 } f942dc2552b8bf Ian Campbell 2011-03-15 1355 :::::: The code at line 1334 was first introduced by commit :::::: f53c3fe8dad725b014e9c7682720d8e3e2a8a5b3 xen-netback: Introduce TX grant mapping :::::: TO: Zoltan Kiss <zoltan.kiss(a)citrix.com&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org